Cronet: Use stale DNS cache entries experimentally.

components/cronet/ios/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/ios/rules.gni")
 import("//build/util/version.gni")
 import("//chrome/version.gni")
 import("//testing/test.gni")
 import("//url/features.gni")
@@ skipping 20 matching lines @@
     "//components/metrics:metrics",
     "//components/metrics/proto:proto",
     "//components/prefs:prefs",
     "//net",
     "//url",
   ]
 
   sources = [
     "../histogram_manager.cc",
     "../histogram_manager.h",
+    "../stale_host_resolver.cc",
+    "../stale_host_resolver.h",
     "../url_request_context_config.cc",
     "../url_request_context_config.h",
     "cronet_bidirectional_stream.cc",
     "cronet_bidirectional_stream.h",
     "cronet_c_for_grpc.cc",
     "cronet_c_for_grpc.h",
     "cronet_environment.cc",
     "cronet_environment.h",
   ]
 
@@ skipping 110 matching lines @@
     ":cronet_framework",
   ]
 }
 
 group("cronet_package") {
   deps = [
     ":cronet_package_copy",
     ":generate_license",
   ]
 }